Power Transistor BU208A NPN, 1500V TO-3

Power Transistor BU208A NPN, 1500V TO-3

Transistors

Reference: TRBU208A

Part.No: BU208A

€2.34

In Stock

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The BU208A is a high-voltage NPN power transistor in a TO-3 package, designed specifically for CRT deflection and flyback (LOPT) applications. It withstands peak voltages up to 1500V and has been the industry standard for television line output stages for decades.

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Description
Product Details

BU208A High-Voltage Power Transistor - CRT Deflection & LOPT Driver

The BU208A is a legendary high-voltage NPN transistor renowned for driving the line output transformer (LOPT) and deflection circuits in CRT monitors and televisions. With a peak collector-emitter voltage rating of 1500V, it remains the go-to choice for vintage TV repair and restoration work.

Functions & Applications

Extreme Voltage Rating: Peak collector-emitter voltage (Vceo) of 1500V handles massive inductive transients in flyback circuits.
Proven LOPT Driver: Purpose-built for line output transformer applications in CRT deflection systems.
Robust TO-3 Package: Large copper-base metallic case provides excellent heat dissipation and mechanical durability.
No Built-in Damper Diode: The 'A' variant requires external protection diode—ensure proper circuit design to prevent voltage spikes.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-3
Peak Collector-Emitter Voltage (Vceo)	1500V
Mounting Type	Through-Hole (THT) – TO-3 with Metal Base

Frequently Asked Questions

Q: What is the difference between BU208A and BU208D?
A: The BU208A has no built-in damper diode and requires an external protection diode in the circuit. The BU208D ('D' for Damper) includes an integrated diode for added protection against inductive spikes.

Q: Can I use the BU208A as a direct replacement in a vintage TV?
A: Yes, but ensure the external flyback diode and circuit topology are intact. Always wear ESD protection and be cautious of residual high voltage in the CRT tube when working with vintage television sets.

Notes

Vintage/NOS part widely used in CRT television and monitor repair. Requires external flyback diode—do not confuse with BU208D which has built-in damper. Handle with ESD precautions due to high-voltage application.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: NPN
Transistor Case Style: TO-3

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